Double-carbon arc-lamp



(No Model.) 2 Sheets-Sheet 1.

E. THOMSON. DOUBLE CARBON ARG LAMP.

No. 295.836. Patented Mar. 25, 1884'.

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@In UU" mi uw I mu N. PETERS. Pwwm-Lmogmphur, wnhiuglo". D. C,

.No Model.) `2 sheetssheet 2.

E. THOMSON.

DOUBLE CARBON ARG LAMP. No. 295,836. Patented Mar. 25, 1884.

N. PETERS. Phmwumagnplr, wnhi nnnnnnnn IINTTED STATES PATENT rtree?,

ELIHU THOMSON, OF NEVBRITAIN, CONNECTICUT, ASSIGNOR TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF CONNECTICUT.

DOUBLE-CARBON ARC-LAMP.

SPECIFICATION forming part of Letters Patent No. 295,836, dated Marc11`25, 1884.

Application filed April 2, 1883. (No model.)

.To @ZZ whom t may concern: l

Be it known that I, ELTHU THoMsoN, a citizen of the United States, and a resident of New Britain, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Double-Carbon Lamps, of which the following is a specification.

My invention relates to electric-arc lamps in which two sets of carbons are employed, one set burning,while the other is held stationary until released by the action of the .first set when its (the latters) carbon is consumed or nearly consumed.

My invention relates more particularly to the special class of double-carbon lamps patented to me by Letters Patent of the United States No. 272,920, in which a catch orlocking device of some suitable construction is employed for normally holding one of the carbons from feeding,'and is released by or through some positively-acting mechanism controlled directly or indirectly by the descent of the other.

My present invention consists in the combination, with the releasing or-feed-controlling clamp for one of the carbons,of a releasing table or stop for said clamp, made movable 4and normally held out of the position where in various ways, some of which I have hereinl described and shown. For instance, the releasinglstop may be mounted on a support consisting of a lever, placed by a spring or otherwise so as to hold said stop from releasing the clamp, said lever being, however, arranged in the path of a stud or its equivalent on the other carbon-carrier, so that at the predetermined time said latter carrier will raise the stop into position where it will act in combination with the clutch or clamp in the usual way. The descent of the first carrier might be made to effect indirectly the proper movement of the clutch-as, for instance, by controlling the circuit of an electro-magnet whose armature-lever or equivalent mechanism carries or supports the stop for the releasing and feeding clamp ofthe other; or any other propercombination or arrangement of devices might be employed whereby the condition or position ofthe feed-controlling stop or detent for the one carbon-carrier shall be controlled by the descent of the other carbon-carrier.

In the'accompanying drawings, Figure l is an elevation of a double-carbon electric lamp, showing one arrangement of devices that may be employed for carrying out my invention. Fig. 2 shows the invention applied to another form of clutch. Fig. 8 shows a modified form of device for imparting movement to the releasing-stop of the one carbon-carrier from a stud or button upon the other. Figs. 4 and 5 show electro-magnetic device which may be employed for setting the releasing-stop. Fig. 6 shows how an equivalent of a projection or stud upon the carrier may be used for controlling the position of the releasing-stop.

Referring to Fig. 1 H H indicate a suitable frame or case, in which the two npper carbon carriers or rods, R R2, are guided and supported, and D indicates any suitable magnet or system of magnets and coils by which the usual reciprocating movements are imparted to thefeed-controlling mechanism of the carbon-carriers, so as to produce a lift of the carbon and the formation of the arc, or to allow a downward movement of the carrier and carbon to compensate for wasting at the arc.

M indicates a core or other equivalent part of the magnet or magnet system, the motion of which core is imparted to the clamps, clutches, or other device through a link, Z, which latter in the rpresent instance is connected toa pivoted table or lever, L, carrying at opposite ends the supports K K, by which the feed clamps or clutches are supported or actuated. The clamps or clutches for the carriers It R2 are indicated at C C2, respectively, and are here shown as the samein construction with the clamp shown in prior patents granted to IOO me. di, through which the carrier may move, and on which is pivoted a clamping clutch or toe, h or l1, which is provided with an extended arm, 5, and is held against the carrier by the action of spring, S or S2, so as to prevent the carrier from moving downward. lf, however, the clamp-body d or d be lowered so as to bring the arm 5 against a suitable stop, the pressure of the clamp on the carrieris relieved, so that the carrier may move downward by gravity.

Atff2 are indicated stops which serve to limit the downward movements of either end of the table or support L.

At g g/ are indicated step projections,which serve to limit the upward movement or play of the clutches, and are formed on a plate, P, supported on the lamp-llame, and made vertically adjustable by any suitable means. These stops might be placed to limit the upward play ol" the end of lever L instead.

The lower or releasing stop `for the clamp or clutch C is indicated at J, and is also formed on plate l?, or is placed in any other suitable position. This stop is fixed in position during the operation ol' the lamp.

The releasing-stop for clutch Cgls indicated at t as supported by or i'ormed on a lever, T, which is pivoted on any suitable support, and normally is held by a spring or gravity in such a position that the stop t for clamp C exerts but littleforce on the arm 5 during the upward and downward movement of the clutches and supporting parts that takes place during the feeding of carrier llt. The spring S2 can thus keep the clamping-toe 71. enga-ged with the carrier @R51 and prevent the latter from moving downward.

B indicates a button or stud on carrier R, which is placed thereon in suitable position to engage with and tilt lever T when the carbon of R is nearly consumed. Then the'lever is tilted, the releasing-stop t is lifted and held in releasing position. Its movement in thus being set is limited by a suitable stop,\'. The carbon-earrier-R is then prevented i'rom further downward movement, and its weight serves to keep the releasing-stop t lifted. By making the plate l? adjustable I am enabled to adjust all the stops at once. This is not, however, essential.

The general operation is as follows: XV hen no current is on, the parts Z, L, &c., which support the clutches, are in their lowermost position. The carbons being inserted in their holders R R2, the carbon in lt will alone come inte Contact with the lower or negative carbon, owing'to the i'act that the arm of clutch C is lifted by stop J, so that the carrier R may drop freely. There being no weight or force upon the end of lever T, (because the but ton '13 is at its upper positiom) the clutch C`1 will be closed upon the carrier R2 by the action of the spring S, so that this carrier will be held up with its carbon out of contact with the lower carbon, the carrier having been Each consists of a body or guide, d or l raised to this position when the carbon is inserted in its socket or clamp. Then the electric current is turned on, the lever L is lil'tcd in the usual way. raising the clutches C CAZ nearly or quite to the upper stops, g y, and forming an are at A. Noarc is formed at A?, the latter being at starting out of contact with its lower carbon. This continues until the magnet system lowers the arm 5 upon the stop J` by lowering the clamp-body by which it is supported. The feeding continues in the usual way until the button B strikes T, when the releasing-stop t for the other clutch is lifted into releasing position and is held up against the stop V', so that when the magnet system lowers the clutch C said clutch will be opened. The stops j' f2 are provided. to insure the requisite movements of each clutch, respectively. The rod RL new feeds d0wnward,and its carbon makes contact for the first time, forming the are at A2, while the carbons at A, though possibly feeding slightly at the moment of transfer, are not allowed to come into contact again. The feed of carrier R now progresses in the usual way.

In Fig. 2 'l have shown my invention as applied to another form of clutch or clamp, known as a tilting7 clutch or clamp. The releasing stop t is, however, formed upon the end of a link supported from the end of the lever T, which latter is shown as pivoted on the frame H. The fixed releasing-stop yt' for clutch C is formed upon or attached to the frame H. The stops gg and f fl are a little differently supported, and the former, y y, are here shown as arranged to stop the lever L, instead et' being arranged in the path of the clutch-arms 5, Fig. l. The action ol' the devices is obviously the same as in the arrangement shown in Fig. l.

In Fig. 3 the support T, forthe movable .releasing-stop t, is in the Vl'erm of a bell-crank lever, the arm t* of which is arranged in the path oi' the button B, so that the latter will act upon the incline of the arm and lift the stop by a wcdging or inclined-plane action upon the support i'or said stop. The act-ion is in other respects the same as already de` scribed.

Fig. 4 illustrates one arrangement that may be employed for lifting or throwing the stop t into releasing position through the intervenv tion el" an electroimagnet controlled by the descent ot' the carbon-carrier R. N indicates an eleetromagnet, whose armature or armature lever supports or carries the stop 1', said electromagnet being placed in a normally-open circuit, 7, connected to or derived from the lampeircuits, or to a suitable source of electric current, in such a way that when the circuit 7 is closed the magnet will be energized and the releasingstop z5 for clutch GL raised into lifting position. Normally the weight el" the armature holds the stop l away. Vhen, however, the carrier lt descends to a deterulinate point, the stud or button B makes contact with a suitably-placed contact-swing, q, thus closing the IOO IIC)

zese a circuit 7, which circuit remains closed, owing l 3. The combination, in a doublecarbon to the presence of the stop g2, which prevents further movement of the carrier R, so that the magnet N continues to hold the releasing-stop t in releasing position.

In Fig. 5 an arrangement of circuits is shown, in which current is normally shunted from magnet N, and said shunt is broken, to energize the magnet, by the action of stud or button B. The shunt-circuit is formed through a stud or screw, w3, and a contact-spring, 104, whose end is in the path of button B, and which is held normally against fw3 by its own resiliency. Vthen the carrier B feeds so far down as to allow the button to bear on the spring, the latter is removed from contact with the stop w3, thus breaking the shunt and energizing the magnet N.

I have described a stud or button, B, on the carrier for producing the desired operation of the support for the movable releasing-stop t; but I do not by any cmeans limit myseli` to such special device, since the same operation might be produced by other devices-as, for instance, by narrowing or reducing the size of the carbon-carrier at its upper end, as indicated at B2, Fig. 6. In this case the stop t is held out of engaging or releasing position by a lever, T, carrying at one end a frictionwheel, which bears upon the carbon-carrier R, as indicated, so as to prevent a spring, Z, from raising the stop t. Vhen, however, the wheel falls into the narrowed or reduced portion ofthe rod, the spring Z lifts the stop into releasing position. A stop, XV, serves to prevent further downward movement of the carrier R.

My invention is not limited to any particular construction of the parts by which the releasing-stop is supported,nor to any particular means for actuating or moving said support, the essence of the invention consisting in moving said stop into operative position through the intervention of devices controlled in their action or operation by the descent of the other carbon-carrier to a predetermined point. Such devices may be mechanical or electro-magnetic, and may be controlled directly or indirectly and mechanically or magnetically bythe movements of the carbon-carrier.

My invention may be readily put into other forms that will obviously suggest themselves to those skilled in the art.

Vhat I claim as my invention isl. The combination, with two 'carbon-carriers in an electric-arc lamp, of a movable releasing-stop for the feeding mechanism of one carrier, and suitable means for bringing said stop into releasing position upon the descent of the other carrier to a predetermined position.

2. The combination, in a doublecarbon lamp, of a releasing-clutch for one of thc carbon-carriers, a movable releasing-stop for said clutch, and means for bringing said stop into releasing position upon the descent of the other carrier to a predetermined position.

lamp, of a releasing-stop for the feed mechanism of one of the carbon-carriers, mounted on a lever, and a lug or projection on the other carbon-carrier, for tilting said lever and carrying said lever into releasing position when the latter carrier has moved to a predetermined point.

4. rlhe combination, in a doublecarbon lamp, of a feed clamp or clutch for one ofthe carbon carriers, areleasing-stop for said clutch, mounted on a lever placed to hold the stop out of releasing position, and a projection onor connected with the other carbon-carrier, for tilting said lever and moving the stop into releasing position.

5. The combination, in a doublecarbon lamp, of a releasing-stop for the feed-controlling clamp of one carrier and means connected directly or indirectly7 with the other carrier for controlling the position of said stop, as and for the purpose described.

6. rlhe combination, with two carbon-carriers, of a releasing-stop for the feed clamp or clutch of one carrier, means connected with the other carrier for setting said stop into releasing position, and a stop or catch for limiting the movement ofthe releasing-stop in the setting operation.

7. rIhe combination, with two carbon-carriers, ofv feed clamps or clutches actuated by a common magnet system, a fixed releasingstop for the clamp or clutch of one carrier, and a movable releasing-stop for the clamp or clutch of the other, set by a button or other suitable device connected with or controlled by the first carrier.

S. The combination, with a clutch for a carbon-carrier, of a releasing-stop, t, mounted on or supported by one arm of a lever, and a button-stud or its equivalent, as described, upon the other carrier, which button or stud engages with the other end of the lever when the carbon is wholly or nearly consumed.

9. The combination of a carbon-carrier, R2, a feed-clutch, C2, a stop, t, a lever, T, a carboncarrier, B, and button B.

10. In a doublecarbon lamp, the combination, with the feed-controlling mechanism engaging with one carbon or carrier, of a releasing-stop, detent, or such like releasing device adapted to canse a release of said feed mechanism whenever, through wasting of said carbon in the arc, the feed-controlling mechanism is lowered to a predetermined extent, said releasing device being mounted in a movable support, of means for holding the same ont of feed-releasing position while the other of the two carbons is in action.

1l. The combination, in a double-carbon lamp, of feed-regulating devices for the two carriers, and a Xed and a movable releasingstop for the respective feed devices of said carriers, mounted on a common adjustable support, as and for the purpose described.

12. In a double-carbon electric lamp, the adjustable support I), carrying the fixed re- IOO IIO

leasiugvstop J, fotone e-.u'i'ieiaud themovzible Signed at New liimiu, in the county o!" releasing-stop t for the other oni'iieif, as and Hartford :uid State of Connecticut), this 29th for the purpose described. day of March, A. D. 1883.

13. The combination, with the two caibou- 1 H l T carriers R Il, of the clutches C G2, releasing- LLUIU HIOMLJO' stops .T @in movable support for stop und XVitnesses: means eonueeted with earl-ier R for setting JOSEPH J. SKINNER, the stop t in releasing position. I XV. O. XVAKEFIELD. 

